Specification: Product Name: Graduated Cylinder Brush Bristle Material: Synthetic Bristle Handle Material: Metal Color: Yellow Silver Tone Bristle Dia: 0.14mm / 0.01inch Brush Size: 180 x 60mm / 7.09 x 2.36inch (L*D) Handle Size: 250 x 3.8mm / 9.84 x 0.15inch (L*D) Total Length: 430mm / 16.93inch Package Content: 4 x Graduated Cylinder Brush Descriptions: Natural boar bristles and stiff and soft bristles. Flexible wound-wire handles conform to odd shapes galvanized steel for rust resistance. Not just for Reagent Bottle or Graduated Cylinder bristles are great for cleaning all sorts of internal surfaces.